Oil temperature regulating structure



July 11, 1944- G. M. MAGRUM ETAL 2,353,577

on. TEMPERATURE REGULATING STRUCTURE Filed July 6, 1942 3 Sheets-Sheet 1July 11, 1944 G. M. MAGRUM TAL OIL TEMPERATURE REGULTING STRUCTURE FiledJuly 6. 1942 3 Sheets-Sheet 2.

' July 11, 1944- vG. M. MAGRUM ETAL 2,353,577 K OIL TEMPERATUREREGULATING STRUCTURE Y 3 sheets-sheet :s

Filed July e, 1942 ZUM 57172055 @Wwe/ /Ya n E f Patented July 1l, 1944OIL TEMIQEBATURE REGULATING Y STRUCTURE Gervase M. Maxxum, Harry L.Chisholm. Jr., and Andrew D. Hodge, Buffalo, N. Y., assignors toHondallle-Hershey Corporation, Detroit, Mich., .a corporationv ofMichigan Application July c, 194,2, serum. 449,950

12 (ci. 23a-s4) This invention relates to temperature regulal tion' ottheilubricating oil gior., hydrocarbon engines. particularly aircraftengines. in order to keep the oil in the most desirable condition forefficient lubrication. v Y V The usual method for temperature regulationof oilis to provide an oil cooler comprising a radiator through whichthe oil from the engine may circulate to becooled, and a warming jacketsurrounding the radiator Vfor warmingthe oil in the radiator at lowtemperatures, together with valve means for normally shutting off theflow through the warming jacket but foropening up for such ow in case ofimpediment to the oil flow through the radiator as when the iiow throughthe radiator becomes sluggish or congealed. Such prior art valvestructure is usually.

in the form of a valve held closed by spring pressure until it issubjected to suillcient pressure to be opened in case of stoppage oftlow through the radiator. y f

An important object of our invention is to provide improved valvingmeanswhich is thermostatically., controlled and'which willV more eiiectivelyand with greater precision control and apportion the oil ilow throughthe radiatorand the warming Jacket to moreemciently control the oiltemperature for proper flow and lubricating condition.

Another important object is to adapt the valving means, normallythermostatically controlled, to vbe responsive to excessive pressure, asin the case of congealingV of the oil in the radiator path or in thewarming jacket path. to relieve the pressure.

A further object is to provide an arrangement quickly open to in whichathermostatic valving assembly isv interposed in the inlet to theradiator and warming jacket, and another thermostatically controlledvalving assembly is interposed in the outlet from the radiator and thewarming jacket so thatl the temperature of both the inilowing oil andtheoutiiowing oil is eective on the thermostatey means for controlthereby of the kvalving assemblies.` l I f s till another object is toprovide an arrangement in which the. `inlet valving assemblyprimarily'shuts oi flow of the oilfrom the engine to the radiator andwarming'jacket and by-passes the oil from the engine directly to areservoir from which the oil is pumped for delivery to the engine, sothat the oil after starting ingthe'engine, will first be warmed up untilthe thermostat meansV for the inletvalving assembly-will respond to setthis assembly for permitting ow to the radiatorand warming jacketandeventually cutting oir. the iiow from the engine directly to thereservoir. Y

The invention alsoembodies other important features, all the various-ieatures being embodied in the structure shown on the drawings, inwhich:

Figure 1 is a side elevation, partly in section, of 'an oil cooler withthe improved valve'structure thereon; 1

Figure 2 is a vertical longitudinal section of the valve structureshowing the thermostat valve assemblies in position for by-pass now andshutting of! of the radiator ilow; Figure 3 is a similar section butshowing the thermostat valve assemblies in position for normaloperationof the cooler; s

Figures is a section on plane IV-IVon Figure 2; and Y Figure 5 is asection on plane V-V on Figure 2. Y Referring particularly to Figurel,Rfindicates the vradiator structureand V the Avalve structure. Theradiator (structure shown is of a conventional type comprising` thecylindrical shell through which extend the tubes Il soldered orotherwise secured'togetherat .their ends and exposed rfor the iiowtherethrough of airV during running of thevehicle." Surrounding theshell V,Ill is the warmingiacket l2 kproviding the annular warmingspacel Il around the shell.

Mounted onv top of the warming jacket is a base' or plate Il on whichthevalve structure V seats and is securedras by screws Il.

The valve structure V comprises the housing I6 having the inlet l1 forthe oil from the engine, andthe outlet Il forthe return flow from theradiator and warming jacket to the reservoirvfrom which the oil to theengine is pumped. Between,

the inlet and the outlet, the valve housing has the vertical wall I9,and within thehousing below the inlet l'l'are the transverse walls 20and 2l between the sides of the housing and connected at .their lowerLends by the horizontal wall 22 extending between the sides oi'thehousing, the wall 22 continuing to the vertical -wall il.. 'Ihe wall,"

is inwardly spaced from the wall II to leave av space 23. The walls,2li, 2| and 22 together with -the side walls of the the outlet 21 which,as will be explained more in detail later, is connected withthe-reservoir from which the engine supply pump draws the oil.

Surrounding the walls which define the valveY the wall I8 and theadjacent end of the housing' il is the space II, these spaces beingseparated ahlited to the right (Figure 2) by the spring I! ierunseatingjci the valve Ii and seating ci the Vvalve Il. the thermostatbody receiving the piungei Il whosahead at this time is held by thespring Il against the adjusting screw H in the plug I. As the thermostatis subjected to highertemperature, the material therein will expand, andas the spring .Il is stronger than the spring 62, the thermostat bodywith the valves thereon will be shifted away from the plunger ll-'andtoward the left for the opening of the valve s2 and the closure of thevalve li, and as from each other by the partition wall Il. In the baseof the housing it `is the inlet passageway Il for the space 31 whichregisters with the passageway 4l in the base plate Il on theradiatorjacket I2, which passageway is in registration with the outlet Il ofthewarmingjacket. The

inlet way I2 in the base of the housing4 Il for the space Il registerswith the passageway Il ln the base plate il, the passageway Ilregistering with the outlet M of the radiator R( In its lower side theradiator has the inlet passageway ll communicating with the warmingiacket space Il. The wall u extends across'the-warming -iacket space ilbetween the jacket inlet 3| andits outlet so that the uid-enteringtheinletvll must travel entirely circumferentially through the forming.-space I8 before reaching the Jacket outlet 4i.

Reierringto ligures 2 and 5, in the inlet-nassageway o! the valvestructure V, the wall 2l hasthe passageway lltherethrough which at itsinner end is surrounded by a valve seat` 4l, and the wail 2i Vhas thepassageway Il therethrough surrounded at itsinner end by a valve seatIl. Within the valve chamber there is a valving assembly comprising Atheannular valve VIl and the annular valve l2 for cooperating respectivelyvwith the valve seats la and Il. Between these valves is a thermostatV'I' whichmay be of the type known in the trade as the Vernet type.'IhisthermOstat'cOmprisesthe body or container Il from which extends aneck Il for a plunger Il to be acted uponfby material Il withinvthecontainer which, when expanded by rising temperature. will shitttheplunger Il outwardly.

.The thermostat-neck M. extends axially through the valve l2, and hasrigidly secured thereto `a collar G, the outside oi' which has aspherical surfaceLlThevalvell hagan internalrnatlng surface.` andisgheld against the surface A by a spring which is linterposed betweenthe valves li and Il. v Y

lll'ormed onthe inner end of the thermostat body Il is a stud C to whichis rigidly secured asleeve D which has, at its inner end, a shoulder E.Y SlidablyA mounted on sleeveD isthe annular reliefvalve t I, the headof which has the spherical surface B and is heldA against amating surandIl, should there be the temperature rises,

the valve I2 will eventually be fully opened and the valve li fullyclosed (Figure 3). The thermostat may continue to 1 expand ai'ter thevalve li has been seated and e unless such overtravel of the thermostatwere allowed for. the thermostat body would burst. To allow for suchovertravel, the sleeve D attached to the thermostat slides axially tothe left within the relief valve Il, the shoulder E of sleeve D movingaway from the stop fingers oi the valve Il; and the collar G, alsoattached to the thermostat, pulls the valve I! further to the lett to a-position beyond its normal i'ull openposition.

The spherical surfaces A and B of the collar G and sleeve D permit thevalves Vl2 and li to align themselves properly on their respective seatsIl misaiignment o! the component parts.

In the valve chamber Il in the outletV side of the frame Il, athermostat and valveA assembly is provided for controlling the eway Ilin the wall l2 and the passageway t'i in the`wall 33. Surrounding theinner end c! the passageway tl is the seat tlV for the annular valve It,and

' surrounding the inner end of the passageway Il is the seat 'it for theannular valve 1|. The thermostat Tl comprises the body 12 having rigidlysecured to its neck Il the collar J, the outside suriace oi' which hasthe spherical portion L and receiving the plunger 'I4 the head oi which-abuts the adjusting screwM in theplug N.v At lits inner end, thethermostat body has formed on it thev stud 1I, rigidly secured to whichis the sleeve K, which has at its inner end the stop shoulder O and onwhich is slidably mounted the face within the valve li by a spring I2,the inner end of which seats against the transverse wall il. InwardlvDrOiecting from the annular valve Il are the lingers F which, reactingagainst the shoulder E on the"V sleeve D, form a'stop for the valve Ilagainst the spring t3; Thisunitary assembly comprising the thermostat.the Vthree valves Il, Il' and Il, Athe spring, Il, the collar G and thesleeve D is shiitable axially, this movementbeing guided by the guidewings ll and Il on the valves li and l2, respectively engaging with'thewalls "and 2i.v The thermostat is adiusted so that at temperaturesbelow, say, F., the thermostat will be in its contracted position andits body together with the valves Will .be 75 valve It.Interposedbetween the 4valves Il and 'il is the spring 11, which urgesthe valves against the shoulder O and the spherical surfaceL,respectively. 'I'he spherical suri'ace L permits proper seating o!valves 1| and n, should there be any misalignment of component parts.

s The axial movement ot the thermostat and` valve'assembly is guided bythev guide wings 'il and lli on the valves ll and 1|, respectively,engaging the walls I2 and Il. The thermostat T' is adjusted so'that whenthe temperature is below, say F.. the thermostat will be contracted andthe'spring 'il will hold the thermostat and valve assembly for closureoi the valve 'il Vand-"the opening of the valve". When sub- Jected tohigher temperature, the the'nnomt will expand, and the against theplunger 1l, will cause the thermostat body with the valves thereon to beshifted toward the right for opening movement of the valve 1i andclosing movement of the valve Il,

vandas the temperature continues to rise, the

spring 1B, y

.. expanding material. acting On Figure 1 is dlagrammatically shown asupply reservoir U for lubricatingri'luid from which the pimp P drawsthe oil for delivery to the engine E, the oil flowing from the enginethrough the inlet I1 o! the valve :structure V. The pump preferablydraws the oil from a sump portion rS separated from the main portion ofthereservoir U `by a suitable baille Il, the auxiliary outlet 21' lorthe space 23 in the valve structure returning oil to this sump. Theoutlet |8for Athe valve structure may be connected .for discharge ,ofthe oil into the main body of the reservoir =O.

Describing now the operatlon. before the engine 'is started, thetemperature Vin the valve structure V is such that .the thermostat VIand T are contracted, as shown on Figure '2, the valves Il and I2 beingrespectively open and closed, and the valves I9 and 1|beingsrespectively open and closed. For example, the thermostat T isadjusted to remain contracted funder. say, 100 F. and the thermostat ,Tis adjusted to remain contracted under, say. 150 F. As the engine vnowstarts, the pump l driven thereby will draw oil from the sump Uv andiorce it through 'the engine bearings, the oil then .flowing from theengine into the inlet Ai1 of the vvalve structureVandpast the open valvethrough Vthe passageway 41 into the space 23 and from there through theauxiliary outlet 21 back to -the sump. This .permits a rapid warming upoi' va Vrelatively AVsmall volume ofthe oil which, upon engagement withthe thermostat `element T, raises the .tem-

perature .thereof above 1001 F. .for operation thereof toopen'the valvel2 and Vmove the'valve Il toward its closing position so thatoilmayzthen 110W into the inlet space andfthrough passageways v29 and 30to the inlet ill of Athe warming jacket, and through the warming kjacketout of the Jacket outlet Il through passagewaysflil and,

Il into the space 31 and past the open valve il! through the outlet I 8back tothe main V-bociyof the reservoir U. After the .temperature:around the thermostat T reaches, say, 140 F.,Ithe ther- 'mostat Lwillhave lexpanded toifully open the .valve 22 and `fully close'the valve 5ll(liig. 3).', Vand all of the engine oil will 4now flow through :the

warming Jacketaround the radiator.' 'This voil from the jacket willwarmup thethermostatT for opening movement thereby of the valve 1iandclosing movement of the valve 09. *Assoon -v as the valve 1I opens,oil will'iiiow from the warming Jacket through they radiator inlet fvv'and through .fthe radiator around the various .tubes Il and Vthroughthe radiatoroutlet u into the l:space ,andpast the :open-valve 1Iandthroug'h the outlet 'It tothe reservoir U. -'When theatemperature.around :the thermostat T'-A reaches, say, 180 F., lthe thermostat willkhave fully fopened the valve "1I and fully `closedlthe valve?" '(Fig.3) so thatall'ot the oil fromtheenginewilli'iiow 'Y through the radiatorto becooled by the-'airfnowing through the radiator tubes ii."Should-the temperature around the thermostat T' fall ibelow 180 F., it`will effect lcorresponding ypartial j opening ofthe valve fori'low of'warm foil" through theiacket vto compensate tortheidrop in `temperature'of `the oil -flow :through the zradiator, and'thus the'thermostat T'iscontinually v Aactive to apportion` thefilow through the radiatorVdetermined ipressure is reached, say,

ilowing through the radiator may :suddenly thicken and Vcongeal the oiltherein `to stop -ilow through 'the radiator even though theoutlet valve1:1 maybe wide open. In order 1to prevent building up of dangerouslyhigh pressure finthe :radiator under these conditions, .the valve IIwill 4function .as a relief Aor blow-ot! `valve. As has been explained,this valve is slidable on .the ther-1' mostat .sleeve vK and when ilowthrough the radiator is suddenly checked. the oil from the een- `ginewill tend to continue its :now ithrough the fwarming jacket, `and Vthe,pressure .of this ow rseat and away strom the 'valve .5i xto yopen :upthe passageway tofthe Vspace :23 for by-,passage'f'oi oil through .the:auxiliary outlet V21 fdirecttofthe reservoir. y Y Y .As Fhas vbeenexplained, the ivalveii `is slid- -able ion fthe sleeve D, and thespring 'l2 is so Vdi- 'mensioned that'when 4the valve 5i is in ftheclosed Vposition ".(Figure f3) lit `avvill :resist `opening of fthevalve ril iuntil'fa predetermined oil pressure is reached, say, vl l'bs..per square inch,

.After ,opening ofthe valve Il .for bil-,passage of -oil Lto "the sumpS, 'the oilin :the space 172| is rapidly .'heated, and fthis heat.'together with the built-:up pressurein fthe zspace 22, twill :quickly-f'cause :resumption of V4ilow ithrough ,the --warming Jacket and.warming Yof `theoil Vin :the .radiator ato :flowing condition, :andfthen, jas the pressure yis relieved, the valve -II will fclose'iorre-establish- V.ment 4oi' .normal operating conditions. Upon :stopping.oi' fthe fenginefthe Jvalving assemblies in the :valve :chambersM-andliewillbe hbroughtback lto .their normal :positions .by:thePsprings '82 and Il .Las the Vrespective ylthennostats cool olf.'

"We i have vdisclosed 1a practical and feillcient em- :bodimentoffouninvention'but'do not r.desir-e to be Eliniited to kthe exactlfstructure, arrangement and :operation :shown [and describe'd, .aslohanges iand "modifications Amay t'be z-'made vwithout -;departihg'from'therscopefoithefinvention. f A

. "-We claim'as ourinVentiOn:

J1. 'Afcontrolling v,valve istructure for .the ;radia -tor flow -and:warming rchamber fiiow 'of zan ,oil cooler, .comprising a housingi-'and `a `.passageway e therethrough ffor'iilow of Voil to Ithe:radiator and fwarming chamberssaidfhousing-havingrganloutlet:passagewaygiorf oilfromgthe: radiator: and .another outlet passagewayc. for ',-theoil from .the :warming chambena .valvetinfgsaid :housing'ffor ther radiator i outlet passageway and sa avalve for the warming:chamber @outlet passageway, fand thermostat lmeanssubjected Vtothea'temperature '..of the oil fnowzthrough .f said zoutlet passagewaysfior setting :of Vsaid valves ffor `apportionment pof *the `ilo.w

l through Athe radiator :and :the ilow pthrough :the

swarming chamber, and means whereby said/warm- 1 ing chamberoutletpassageway-valve-,after closure thirty' way.'` f A 2. A valve .structurefor an internal combustion engine oil cooler connected to discharge thecooled oil into a reservoir from which the engine is supplied withlubricating oil by a pump, fcomprlsing a valve chamber for receiving theoil from the engine. a supply Ypassageway from said valve chamber-'tothe cooler, a by-passageway from said ,valve-chamber. directly tothe'reservoir, a thermostat comprisinga generally cylindrical bodycontaining temperature-responsive medium and a plungeractuated thereby,an annular valve i'or Y v said supplyv passageway. concentric with andseated on saidthermostat body, an annular valve for said lay-passagewayconcentric with and mounted on said thermostat body and having apassagewayV therethrough, a spring interposed beestas?? cooled oil intoa reservoir from which is supplied with lubricating oil bra pump.prising a valve chamber tor receiving the oil the engine, a supplypassageway from said valve chamber 'to the cool said by-eway, athermostat comprising a body oi' generally cylindrical shape containingtemperature-responsive medium and a plunger to he actuated thereby, saidthermostat body extending through said valves and having shoulders, aspring between said valves tending to hold them against said shoulders,an abutment for the outer end of the thermostatV plunger, saidthermostat when contracted setting said supply passagewayvalve and saidby-passageway valve tween said valves tendingto hold them in noraryvabutment for the outer end o! the plunger or said thermostat, saidsupply passageway valve and said by-passageWayyaIVe being respectivelyclosed and opened by said thermostat when said thermostat is contractedand expansion of said thermostat under temperature increase eilectingrespectively opening and closing or said supply e' passageway andby-passageway, a relief valve ,slidable on saidrthermostat'bodyrand aspring normally holding said relie! valve for closure oi' passagewaythrough ksaid by-passageway valve. said spring yieldingtopredeterminedoil V"pressurein vsaid valve chamberfor opening of l saidrelief valve for now of oil from4 the engine directly to said reservoirin the event that ilow through said supplypassageway is stopped whilesaid supplypassageway valve is open and said by-passagewayvalve isclosed. l i

3. A valve structure for an internal combustion engine cooler.'connected tofdischargeithe cooled oil into areservoir from which theengine is'supplied with lubricating oilby a pump, comprising a valvechamber for receiving the oil from the engine, a supply passageway fromsaid valve vmal position on said thermostat body, a stationrespectivelyto closed and open positions for iiow oi' the engine oil through saidby-passageway directly to the reservoir, said thermostat underpredetermined temperature increase expanding to elect respectivelyopening and closure oi said supply passageway valve and saidlay-passageway valve for iiow of all the engine oil to the cooler, saidthermostat body being axially movable relative to said by-passagewayvalve against the nesistance of said spring when said by-passageway Yvalve is closed, whereby'ovexexpansion of said 'chamber to the cooler, aby-passageway from said v valve chamberV directly to they reservoir, avalve for said supply passageway and a valve for said lily-passageway, athermostat comprising a body off generally cylindrical shape containingtemperature-responsive medium and a plunger to be actuated thereby, saidthermostat body extending through saidvalves and-having shoulders,.avspring between said valves .tending to hold them against said shoulders,-an :abutment for the outer end of the thermostat plunger, saidthermostat when contracted setting said supply passageway -valve andlsaid by-passageway valve respectively to closed and open positions forflow of the engineoil through said by-passagewaydirectly to thereservoir, said thermostat under predetermined temperature increaseexpanding to elect respectively and closure o! said supply passagewayvalve and said by-passageway valve for iiow ot engine oil tothe cooler,said thermostat body being axially movable re1- ative 'to saidlay-passageway valve against the resistance oi' `said spring when saidby-passageway valve is closed, whereby overexpansion of said thermostatis relieved.

4. A valve structure for an internal combustionengine cooler connectedto discharge the 1g thermostat is relieved, said by-passag'eway valvehaving a -passage therethrough, a blowoi! valve .movable on saidthermostat body and a spring normally holding said blowoi! valve againstsaid lay-passageway valve to close said passage, said blowoil? valvespring being responsive to a predetermined pressure to be opened forilow oi the engine koil directly to the reservoir when said bypassagewayvalve and said supply passageway valve are respectively closed and openand the iiow through the cooler is stopped.

5. A controlling valve structure for the radiator now and warmingchamber flow of an oil cooler, comprising a housing and a passagewaytherethrough for ilowV of oil to the radiatorv and warmin g chamber,said housing having anoutlet passageway for oil from the radiator andanother outlet passageway ior the oil from the chamber, a valve in saidhousing for the radiator outlet passageway and a valve for the warmingchamber outlet passageway, a thermostat comprising a body structure ofgenerally cylindrical shape containing temperature-responsive medium anda plunger actuated thereby, an abutment on said housing for the outerend oi said plunger, `said thermostat body structure extending at itsends through said valves and providing iupports therefor, a springinterposed between said valves tending to hold them in normal positionon said supports, a second spring for holdingv said thermostat bodystructure for closure by said valve 'of Vsaid radiator outlet passagewayand opening 6. Valve structure for an internal combustion engine oilcooler connected to discharge the cooled oil into a reservoir from whichthe engine is supplied with lubricating oil by a pump, comprising avalve chamber interposed in the path of the oil fiow and having twopassageways to the exterior thereof, a thermostat in said valve chamberbetween said passageways, valves for said passageways mounted on saidthermostat, shoulders on said thermostat limiting outward movement ofthe valves thereon but permitting inward movement thereof, and a springtending to hold said valves against said shoulders, said thermostat inresponse to temperature change carrying said valves for exposurey of oneof said passageways and closure of the other passageway, said springpermitting opening movement of the closed valve independently ofmovement of said thermostat.

'1. Valve structure for an internal combustion engine oil coolerconnected to discharge cooled oil into a reservoir from which the engineis supplied with lubricating oil by a pump, comprising a valve chamberhaving passageways to the exterior thereof, valves for said passageways,a thermostat structure within said valve chamber upon which said valvesare mounted, shoulders on said thermostat structure for limiting outwardmovement of said valves thereon permitting inward movement thereof, anda spring tending to hold said valves against said shoulders, saidthermostat structure being responsive to temperature change to carrysaid valves for closure of one of said passageways and exposure of theother, said spring permitting either valve after closure by saidthermostat structure to be opened against the resistance of said springby external pressure and independently of movement of said thermostatstructure.

8. Valve structure for controlling the flow of oil from an internalcombustion engine to an oil cooler, comprising a valve chamber having arlrst outlet passageway and a second outlet passageway, a thermostatstructure of the so-called "Vernet type having a body containingtemperature response mediu'm and a plungerL a stationary abutment forthe plunger, a first valve and a second valve for said first and secondpassageways respectively, said valves being mounted on said thermostatconcentric therewith and said first valve having a passagewaytherethrough, a shoulder on said thermostat body and a spring thereontending to hold said first valve against said shoulder, a blow-off valveslidable on said thermostat body, and a spring tending to hold saidblow-off valve against the outer side of said first valve for closure ofthe passageway therethrough, expansion of said thermostat medium inresponse to temperature increase causing movement of said body with thefirst and second valves thereon for opening of said second passageway bysaid second valve and closure of said first passageway by said firstvalve against the resistance of said blow-olf valve spring, excesspressure in said valve chamber after closure of said first valve by saidthermostat structure causing opening of said blow-of! valve for flow ofuid through the passageway in. said nrst valve.

9. Valve structure for controlling the now of oil under pressure througha cooling `structure and through a heating structure associated with thecooling structure for heating thereof, comprising annular valvesinterposed in the outlet flow of said structures, a thermostat of theso-called Vernet type having a body with temperature therethrough forflow of oil to the radiator andv responsive medium therein, said valvesbeing mounted on the thermostat body concentric therewith, said bodyhaving shoulders thereon, and a spring tending to hold said valvesoutwardly against said shoulders but permitting inward movement thereofon said body whereby upon closure of one of said valves by saidthermostat structure said valve may be moved inwardly on the thermostatbody by external pressure and against the resistance of the spring onsaid body.

10. A controlling valve structure for the radiator flow and warmingchamber flow of an oil cooler, comprising a housing and a passagewaytherethrough for flow of. oil to the radiator and warming chamber, saidhousing having an outlet passageway for oil from the radiator andanother outlet passageway for the oil from the warming chamber, a valvein said housing for the radiator outlet passageway and a valve for thewarming chamber outlet passageway, thermostat means subjected to thetemperature of the oil flow through said outlet passageways for settingof said valves for apportionment of the flow through the radiator andflow through the warming chamber, and means whereby one of said valves,after closure thereof by said thermostat means, is movable independentlyof said thermostat means to respond to excess pressure in thecorresponding outlet passageway for opening movement thereof.

11. A controlling valve structure for the radiator flow and warmingchamber flow of an oil cooler, comprising a housing and a passagewaytherethrough for iiow of oil to the radiator and warming chamber, saidhousing having an outlet passageway for oil from the radiator andanother outlet passageway for the oil fromthe warming chamber, a valvein said housing for the radiator outlet passageway and a valve for thewarming chamber outlet passageway, thermostat means mounting said valvesand subjected to the temperature of the oil flow through said outletpassageways for setting of said valves for apportionment of the flowthrough the radiator and flow through the warming chamber, and meanswhereby one of said valves, after being closed by said thermostat means,is movable independently of said thermostat means to respond to excesspressure in the corresponding outlet passageway for opening movementthereof.

12. A controlling valve structure for the radiator flow and warmingchamber flow of an oil cooler, comprising a housing having a passagewaywarming chamber, said housing having an outlet passageway for oil fromthe radiator and 'another outlet passageway for the oil from the warmingchamber, a valve in said housing for the radiator outlet passageway and'a valve for the warming chamber outlet passageway, thermostat meanssubjected to the temperature of the oil flow throughsaid outletpassageways for setting of said valves for apportionment of the flowthrough the radiator and the flow through the warming chamber, and meanswhereby, when one of said Y valves is closed and the other valve openedby said thermostat means, the closed valve may move independently ofsaid thermostat means in response to excess pressure in thecorresponding outlet passageway caused by abnormal restriction to nowthrough the other outlet passageway.

GERVASE M. MAGRUM. HARRY n CHIsHoLM, JR. ANDREW D. HoDGE.

